<!DOCTYPE html>



<html>

<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }
        
        .wrap {
            width: 300px;
            margin: 100px auto 0;
        }
        
        table {
            border-collapse: collapse;
            border-spacing: 0;
            border: 1px solid #c0c0c0;
            width: 300px;
        }
        
        th,
        td {
            border: 1px solid #d0d0d0;
            color: #404060;
            padding: 10px;
        }
        
        th {
            background-color: #09c;
            font: bold 16px "微软雅黑";
            color: #fff;
        }
        
        td {
            font: 14px "微软雅黑";
        }
        
        tbody tr {
            background-color: #f0f0f0;
            text-align: center;
        }
        
        tbody tr:hover {
            cursor: pointer;
            background-color: #fafafa;
        }
    </style>
</head>

<body>
    <div class="wrap">
        <table>
            <thead>
                <tr>
                    <th>
                        <input type="checkbox" id="j_cbAll" />
                    </th>
                    <th>菜名</th>
                    <th>饭店</th>
                </tr>
            </thead>
            <tbody id="j_tb">
                <tr>
                    <td>
                        <input type="checkbox" />
                    </td>
                    <td>红烧肉</td>
                    <td>田老师</td>
                </tr>
                <tr>
                    <td>
                        <input type="checkbox" />
                    </td>
                    <td>西红柿鸡蛋</td>
                    <td>田老师</td>
                </tr>
                <tr>
                    <td>
                        <input type="checkbox" />
                    </td>
                    <td>红烧狮子头</td>
                    <td>田老师</td>
                </tr>
                <tr>
                    <td>
                        <input type="checkbox" />
                    </td>
                    <td>日式肥牛</td>
                    <td>田老师</td>
                </tr>

            </tbody>
        </table>
    </div>

    <script src="jQuery版本/jquery-3.6.0.js"></script>
    <script>
        $(function() {
            $('#j_cbAll').click(function() {
                if ($(this).prop('checked')) {
                    // console.log($('#j_tb>tr>td>input'));
                    $('#j_tb>tr>td>input').prop('checked', true);
                } else {
                    $('#j_tb>tr>td>input').prop('checked', false);
                }
            });
            $('#j_tb>tr>td>input').click(function() {
                var int = $('#j_tb>tr>td>input').length;
                console.log(int)
                var inti = $('#j_tb>tr>td>input:checked').length;
                // console.log(inti)
                if (int == inti) {
                    $('#j_cbAll').prop('checked', true);
                } else {
                    $('#j_cbAll').prop('checked', false);
                }
            })
        });
    </script>

</body>

</html>